The synthesis of pyrrolo[1,2-b][1,2,5]benzothiadiazepines from 1,2-thiazine 1-oxides—sulfonamide analogues of the pyrrolobenzodiazepine antitumour natural products
作者:Karl Hemming、Nilesh Patel
DOI:10.1016/j.tetlet.2004.08.136
日期:2004.10
2-(o-azidobenzenesulfonyl)-1,2-thiazine 1-oxides via Diels–Alder reaction. After a one-pot ring contraction, desulfurisation and aromatisation process, accompanied by concomitant same pot conversion of the azide group into a primary amine via the Staudinger reaction, these 1,2-thiazine-1-oxides yield a 1-(o-aminobenzenesulfonyl)pyrrole. N-Formylation of the amine and Bischler–Napieralski ring closure onto the pyrrole
吡咯并[ 2,1- c ] [1,4]苯并二氮杂卓(PBDs)和相应的吡咯并苯并噻二氮杂卓(PBTDs)作为天然和合成的抗肿瘤抗生素和非核苷类逆转录酶抑制剂是有吸引力的靶标。提出了PBTD类的简明合成方法,该方法从邻叠氮基苯磺酰胺开始,并通过Diels-Alder反应将其转化为2-(邻叠氮基苯磺酰基)-1,2-噻嗪1-氧化物。一锅环收缩,脱硫和芳构化过程后,伴随叠氮化物基团通过施陶丁格反应同时锅转化为伯胺,这些1,2-噻嗪-1-氧化物产生1-(邻氨基苯磺酰基))吡咯。ñ胺的甲酰化和Bischler-Napieralski闭环到吡咯上完成了PBTD的合成。